$4\left(7x-2x^2\right)$
$9x^2-4x+3$
$\frac{3}{2}x^5+32$
$4x^2-2x-3+6x^2+x-6+2x^2-x+3$
$3-4+\left(5\cdot6^2\right)$
$\left(+\:15\right)\:.\:\left(-\:3\right)\:+\:\left(-\:4\right)\:.\:\left(+\:5\right)\:$
$x^2-225$
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